import crypto from "node:crypto";
import type { SerializedProjectCommand } from "./project-command.model.js";

export const projectFloorInsertCommandType = "project-floor.insert" as const;
export const projectFloorDeleteCommandType = "project-floor.delete" as const;
export const projectRoomInsertCommandType = "project-room.insert" as const;
export const projectRoomDeleteCommandType = "project-room.delete" as const;
export const projectLocationStructureCommandSchemaVersion = 1 as const;

export interface ProjectFloorSnapshot {
  id: string;
  projectId: string;
  name: string;
  sortOrder: number;
}

export interface ProjectRoomSnapshot {
  id: string;
  projectId: string;
  floorId: string | null;
  roomNumber: string;
  roomName: string;
}

interface ProjectFloorStructureCommandPayload {
  floor: ProjectFloorSnapshot;
}

interface ProjectRoomStructureCommandPayload {
  room: ProjectRoomSnapshot;
}

export interface ProjectFloorInsertProjectCommand
  extends SerializedProjectCommand<ProjectFloorStructureCommandPayload> {
  schemaVersion: typeof projectLocationStructureCommandSchemaVersion;
  type: typeof projectFloorInsertCommandType;
}

export interface ProjectFloorDeleteProjectCommand
  extends SerializedProjectCommand<ProjectFloorStructureCommandPayload> {
  schemaVersion: typeof projectLocationStructureCommandSchemaVersion;
  type: typeof projectFloorDeleteCommandType;
}

export interface ProjectRoomInsertProjectCommand
  extends SerializedProjectCommand<ProjectRoomStructureCommandPayload> {
  schemaVersion: typeof projectLocationStructureCommandSchemaVersion;
  type: typeof projectRoomInsertCommandType;
}

export interface ProjectRoomDeleteProjectCommand
  extends SerializedProjectCommand<ProjectRoomStructureCommandPayload> {
  schemaVersion: typeof projectLocationStructureCommandSchemaVersion;
  type: typeof projectRoomDeleteCommandType;
}

export type ProjectLocationStructureProjectCommand =
  | ProjectFloorInsertProjectCommand
  | ProjectFloorDeleteProjectCommand
  | ProjectRoomInsertProjectCommand
  | ProjectRoomDeleteProjectCommand;

export function createProjectFloorSnapshot(
  projectId: string,
  name: string,
  sortOrder: number
): ProjectFloorSnapshot {
  const floor: ProjectFloorSnapshot = {
    id: crypto.randomUUID(),
    projectId,
    name: name.trim(),
    sortOrder,
  };
  assertProjectFloorSnapshot(floor);
  return floor;
}

export function createProjectRoomSnapshot(
  projectId: string,
  input: {
    floorId?: string;
    roomNumber: string;
    roomName: string;
  }
): ProjectRoomSnapshot {
  const room: ProjectRoomSnapshot = {
    id: crypto.randomUUID(),
    projectId,
    floorId: input.floorId?.trim() || null,
    roomNumber: input.roomNumber.trim(),
    roomName: input.roomName.trim(),
  };
  assertProjectRoomSnapshot(room);
  return room;
}

export function createProjectFloorInsertProjectCommand(
  floor: ProjectFloorSnapshot
): ProjectFloorInsertProjectCommand {
  assertProjectFloorSnapshot(floor);
  return {
    schemaVersion: projectLocationStructureCommandSchemaVersion,
    type: projectFloorInsertCommandType,
    payload: { floor },
  };
}

export function createProjectFloorDeleteProjectCommand(
  floor: ProjectFloorSnapshot
): ProjectFloorDeleteProjectCommand {
  assertProjectFloorSnapshot(floor);
  return {
    schemaVersion: projectLocationStructureCommandSchemaVersion,
    type: projectFloorDeleteCommandType,
    payload: { floor },
  };
}

export function createProjectRoomInsertProjectCommand(
  room: ProjectRoomSnapshot
): ProjectRoomInsertProjectCommand {
  assertProjectRoomSnapshot(room);
  return {
    schemaVersion: projectLocationStructureCommandSchemaVersion,
    type: projectRoomInsertCommandType,
    payload: { room },
  };
}

export function createProjectRoomDeleteProjectCommand(
  room: ProjectRoomSnapshot
): ProjectRoomDeleteProjectCommand {
  assertProjectRoomSnapshot(room);
  return {
    schemaVersion: projectLocationStructureCommandSchemaVersion,
    type: projectRoomDeleteCommandType,
    payload: { room },
  };
}

export function assertProjectFloorInsertProjectCommand(
  command: SerializedProjectCommand<unknown>
): asserts command is ProjectFloorInsertProjectCommand {
  assertProjectFloorStructureProjectCommand(
    command,
    projectFloorInsertCommandType
  );
}

export function assertProjectFloorDeleteProjectCommand(
  command: SerializedProjectCommand<unknown>
): asserts command is ProjectFloorDeleteProjectCommand {
  assertProjectFloorStructureProjectCommand(
    command,
    projectFloorDeleteCommandType
  );
}

export function assertProjectRoomInsertProjectCommand(
  command: SerializedProjectCommand<unknown>
): asserts command is ProjectRoomInsertProjectCommand {
  assertProjectRoomStructureProjectCommand(
    command,
    projectRoomInsertCommandType
  );
}

export function assertProjectRoomDeleteProjectCommand(
  command: SerializedProjectCommand<unknown>
): asserts command is ProjectRoomDeleteProjectCommand {
  assertProjectRoomStructureProjectCommand(
    command,
    projectRoomDeleteCommandType
  );
}

export function assertProjectFloorSnapshot(
  floor: unknown
): asserts floor is ProjectFloorSnapshot {
  if (!isPlainObject(floor) || Object.keys(floor).length !== 4) {
    throw new Error("Project-floor snapshot is invalid.");
  }
  assertNormalizedNonEmptyString(floor.id, "floor.id");
  assertNormalizedNonEmptyString(floor.projectId, "floor.projectId");
  assertNormalizedNonEmptyString(floor.name, "floor.name");
  if (
    typeof floor.sortOrder !== "number" ||
    !Number.isSafeInteger(floor.sortOrder) ||
    floor.sortOrder < 0
  ) {
    throw new Error("floor.sortOrder must be a non-negative integer.");
  }
}

export function assertProjectRoomSnapshot(
  room: unknown
): asserts room is ProjectRoomSnapshot {
  if (!isPlainObject(room) || Object.keys(room).length !== 5) {
    throw new Error("Project-room snapshot is invalid.");
  }
  assertNormalizedNonEmptyString(room.id, "room.id");
  assertNormalizedNonEmptyString(room.projectId, "room.projectId");
  if (room.floorId !== null) {
    assertNormalizedNonEmptyString(room.floorId, "room.floorId");
  }
  assertNormalizedNonEmptyString(room.roomNumber, "room.roomNumber");
  assertNormalizedNonEmptyString(room.roomName, "room.roomName");
}

function assertProjectFloorStructureProjectCommand(
  command: SerializedProjectCommand<unknown>,
  expectedType:
    | typeof projectFloorInsertCommandType
    | typeof projectFloorDeleteCommandType
) {
  if (
    command.schemaVersion !== projectLocationStructureCommandSchemaVersion ||
    command.type !== expectedType ||
    !isPlainObject(command.payload) ||
    Object.keys(command.payload).length !== 1
  ) {
    throw new Error("Unsupported project-floor structure command.");
  }
  assertProjectFloorSnapshot(command.payload.floor);
}

function assertProjectRoomStructureProjectCommand(
  command: SerializedProjectCommand<unknown>,
  expectedType:
    | typeof projectRoomInsertCommandType
    | typeof projectRoomDeleteCommandType
) {
  if (
    command.schemaVersion !== projectLocationStructureCommandSchemaVersion ||
    command.type !== expectedType ||
    !isPlainObject(command.payload) ||
    Object.keys(command.payload).length !== 1
  ) {
    throw new Error("Unsupported project-room structure command.");
  }
  assertProjectRoomSnapshot(command.payload.room);
}

function assertNormalizedNonEmptyString(
  value: unknown,
  field: string
): asserts value is string {
  if (
    typeof value !== "string" ||
    !value ||
    value !== value.trim()
  ) {
    throw new Error(`${field} must be a normalized non-empty string.`);
  }
}

function isPlainObject(value: unknown): value is Record<string, unknown> {
  return value !== null && typeof value === "object" && !Array.isArray(value);
}